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In Antirrhinum, a cross between true-breeding red (RR) and white (rr) flowered plants produces pink (Rr) F1 plants. What is the F2 phenotypic ratio?
A3 red : 1 white
B1 red : 2 pink : 1 white
C9 red : 3 pink : 3 white : 1 albino
D1 red : 1 pink
Answer & Solution
Correct answer: B. 1 red : 2 pink : 1 white
Incomplete dominance gives a 1:2:1 phenotypic ratio that matches the genotypic ratio, because the heterozygote (Rr) shows an intermediate phenotype (pink) distinct from both homozygotes.
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